code: def forward(self, prev_layers):
      out = self.mutable(prev_layers[-1])
      if self.skipconnect is not None:
          connection = self.skipconnect(prev_layers[:-1])
          if connection is not None:
              out = out + connection
      return self.batch_norm(out)
  
file_path: nni/examples/nas/legacy/oneshot/enas/macro.py
imports: import torch.nn
  from nni.nas.pytorch import mutables
  from ops import FactorizedReduce, ConvBranch, PoolBranch
label_desc: Use image node_id 2 for calling the ENASLayer obj's underlying member method code with example usage: obj.forward(prev_layers) and returns: self